The central theme of Ozymandias (Ozymandias was another name of Ramses the Great, pharaoh of the nineteenth dynasty of ancient Egypt) is mankind's hubris. All works of humankind - including power structures and governments - eventually must pass into history, no matter how permanent they may seem. All earthly things must pass - “Sic transit gloria mundi” - and.only the eternal remain.
[Excerpted [in part] from Wikipedia]
OZYMANDIAS
I met a traveller from an antique land
Who said: Two vast and trunkless legs of stone
Stand in the desert. Near them on the sand,
Half sunk, a shatter'd visage lies, whose frown
And wrinkled lip and sneer of cold command
Tell that its sculptor well those passions read
Which yet survive, stamp'd on these lifeless things,
The hand that mock'd them and the heart that fed.
And on the pedestal these words appear:
"My name is Ozymandias, king of kings:
Look on my works, ye Mighty, and despair!"
Nothing beside remains: round the decay
Of that colossal wreck, boundless and bare,
The lone and level sands stretch far away.
- Percy Bysshe Shelley